Nsryjdtyk

I am struggling with freetypegl and height calculations. I found the cherno used the library in his Sparky engine and he calculates it like so

float Font::GetHeight(const String& text) const

{

    using namespace ftgl;



    const maths::vec2& scale = m_Scale;

    float min = 0.0f;

    float max = 0.0f;

    for (int i = 0; i < text.size(); i++)

    {

        texture_glyph_t* glyph = texture_font_get_glyph(m_FTFont, text[i]);

        SP_ASSERT(glyph);

        float height = glyph->height / scale.y;

        float offset = glyph->offset_y / scale.y - height;

        if (offset < min)

            min = offset;

        if (height > max)

            max = height;

    }

    return abs(min) + abs(max);

}



maths::vec2 Font::GetOffsets(const String& text) const

{

    using namespace ftgl;



    if (text.empty())

        return maths::vec2(0.0f, 0.0f);



    texture_glyph_t* glyph = texture_font_get_glyph(m_FTFont, text[0]);

    SP_ASSERT(glyph);



    float yo = 0.0f;

    const maths::vec2& scale = m_Scale;

    for (int i = 0; i < text.size(); i++)

    {

        texture_glyph_t* glyph = texture_font_get_glyph(m_FTFont, text[i]);

        SP_ASSERT(glyph);

        float height = glyph->height / scale.y;

        float offset = glyph->offset_y / scale.y - height;

        if (offset < yo)

            yo = offset;

    }



    return maths::vec2(glyph->offset_x / scale.x, yo);

}

and it does not satisfy me, because for example [fps] string is a bit too height as I'd like it to be.

my code example:

//                                                        A B G R

// text = "[fps]"; position = {200.0f, 200.0f}; color = 0xffffffff

renderer2D->DrawString("[fps]", 200.0f, 0xffffffff, font);



//position X = 200.0f; position Y = 200.0f + font.getOffsets("[fps]").y

//width = font.getWidth("[fps]"; height = font.getHeight("[fps]");

//          A B G R

//color = 0xff0000ff

//thickness = 0.2f

renderer2D->DrawRect(Rect(200.0f, 

                          200.0f + font.getOffsets("[fps]").y, 

                          font.getWidth("[fps]"), 

                          font.getHeight("[fps]")), 0xff0000ff, 0.2f);

I want the rect to be around the text so I add offset (which is negative) to position Y, because letters like p, q, g etc. have a bit different height, so when I add offset Y it will cover whole letter.

the problem shows when the text has chars like: @, [, ]

its height is a bit too big

it should be a bit lower like this:

and that'd be perfect.

How can I achieve this?